植被恢复程度与沙地土壤性质--以塔克拉玛干沙漠南缘为例

Soil Properties of Different Sandy Lands under Different Vegetation Recovering Levels——A Case in Southern Taklimakan Desert

为进一步揭示塔克拉玛干沙漠南缘植被恢复对沙土的影响,调查研究了4种不同植被恢复程度沙地的土壤理化性质。结果表明:植被恢复与土壤理化性质动态的关系密切。随着植被恢复程度增加,沙土细粒成分增加,中砂成分减少,土壤平均粒径减小,但沙地土壤粒径峰度、偏度和分维值差异不大;不同土层深度沙土粒径组成的变化表现出与沙漠化逆转过程相一致的特点;植被恢复对土壤化学性质的影响表现为中、下层土有机质、有效磷、有效钾含量增加,但沙地土壤全氮的差异不显著。以植被恢复为前提的沙漠化逆转是土壤细粒化和营养富集的过程,但其演变是一个较为长期的过程。

Aim to reveal the effects of vegetation recovering on sandy soil,soil physical and chemical properties of sandy lands under different vegetation recovering levels were investigated in southern Taklimakan desert. Results showed significant variance among different soils of sandy lands. Under vegetation recovering actions,more fine sands but less medium sands took shape,leading to the decrease of the mean soil particle size. The kurtosis and skewness of soil particle distribution under different vegetation recovering levels showed little variance. The soil organic matter,available P and available K content increased through vegetation recovering time,while soil total nitrogen content didn＇t differ much at all. The difference of soil particle components in different soil depth performed to be in line with the process of desertification reverse. Although soils improved under the vegetation recovering actions,soil evolution will need a much longer period in this area. More attention should be paid to soil improvement during the desertification reverse process.